<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="./lib/vue.js"></script>
</head>
<body>
<div id="box"></div>

</body>
<script>
    const data = {
        str : 'sxx'
    };
    const vm1 = new Vue({
        el : '#box',
        data
    });
    const vm2 = new Vue({
        el : document.querySelector('#box'),
        data
    });

    console.log(vm1)
    console.log(vm1.$data === data);
</script>
</html>